#include "..\\..\\stdafx.h"
#include "..\\..\\include\\sock\\CBase64.h"

namespace FaceCat{
	CBase64::CBase64(void){  
	}  
  
	CBase64::~CBase64(void)  {  
	}  
  
	string CBase64::encode(const unsigned char *Data,int DataByte){  
		const char EncodeTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";   
		string strEncode;  
		unsigned char Tmp[4] = {0};  
		int LineLength = 0;  
		for(int i = 0;i < (int)(DataByte / 3); i++){  
			Tmp[1] = *Data++;  
			Tmp[2] = *Data++;  
			Tmp[3] = *Data++;  
			strEncode += EncodeTable[Tmp[1] >> 2];  
			strEncode += EncodeTable[((Tmp[1] << 4) | (Tmp[2] >> 4)) & 0x3F];  
			strEncode += EncodeTable[((Tmp[2] << 2) | (Tmp[3] >> 6)) & 0x3F];  
			strEncode += EncodeTable[Tmp[3] & 0x3F];  
			if(LineLength += 4,LineLength == 76) {strEncode += "\r\n"; LineLength=0;}  
		}   
		int Mod = DataByte % 3;  
		if(Mod == 1){  
			Tmp[1] = *Data++;  
			strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2];  
			strEncode += EncodeTable[((Tmp[1] & 0x03) << 4)];  
			strEncode += "==";  
		}  
		else if(Mod==2){  
			Tmp[1] = *Data++;  
			Tmp[2] = *Data++;  
			strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2];  
			strEncode += EncodeTable[((Tmp[1] & 0x03) << 4) | ((Tmp[2] & 0xF0) >> 4)];  
			strEncode += EncodeTable[((Tmp[2] & 0x0F) << 2)];  
			strEncode += "=";  
		}  
		return strEncode;  
	}  
  
	string CBase64::decode(const char *Data,int DataByte,int& OutByte){   
		const char DecodeTable[] =  {  
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  
			62,  
			0, 0, 0,  
			63,   
			52, 53, 54, 55, 56, 57, 58, 59, 60, 61,   
			0, 0, 0, 0, 0, 0, 0,  
			0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,  
			13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,   
			0, 0, 0, 0, 0, 0,  
			26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,  
			39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,   
		};    
		string strDecode;  
		int nValue;  
		int i= 0;  
		while (i < DataByte){  
			if (*Data != '\r' && *Data!='\n'){  
				nValue = DecodeTable[*Data++] << 18;  
				nValue += DecodeTable[*Data++] << 12;  
				strDecode += (nValue & 0x00FF0000) >> 16;  
				OutByte++;  
				if (*Data != '='){  
					nValue += DecodeTable[*Data++] << 6;  
					strDecode += (nValue & 0x0000FF00) >> 8;  
					OutByte++;  
					if (*Data != '='){  
						nValue += DecodeTable[*Data++];  
						strDecode += nValue & 0x000000FF;  
						OutByte++;  
					}  
				}  
				i += 4;  
			}  
			else{  
				Data++;  
				i++;  
			}  
		}  
		return strDecode;  
	}  
}